The inferno at Tyreek Hill's mansion caused the NFL superstar's property to lose over $2 million in value ... this according to an incident report obtained by TMZ Sports.
In the docs, officials say the Southwest Ranches, Fla. residence -- which the wide receiver bought for $6.9 million in 2022 -- had an estimated value of $5.6 million before the flames ... but the blaze caused some $2.3 million in damages.
What's worse for Hill ... officials also said in the docs they believe around $1 million worth of stuff was destroyed during the incident as well.
Authorities provided a little more detail on how they believe the blaze all started ... writing in the documents that two kids at the home told them they had been playing with a lighter which they "thought was a toy and accidentally lit a toy on fire."
"They got scared," officials said, "threw the toy, and ran."
According to the report, the child who started the fire was a 4-year-old.
The report states no one was injured ... and an investigation into the blaze is now closed.
As we reported, a 911 caller initially told law enforcement of the fire at around 1:50 PM ET on Jan. 3. Hill was not present at the time it broke out ... though he did leave Dolphins practice early to tend to the matter.